Apparatus for superheating steam.



PATENTED AUG. 14, 1906.

A. BOLTON.

APPARATUS FOR SUPERHEATING STEAM.

APPLICATION FILED NOV. 2-, 1904.

WITNESSES:

Maw- M W JJJJJJJ HI 5 ATT ORNEY-S.

No. 828,807. PATENTED AUG. 14, 1906.

A. BOLTON.

APPARATUS FOR SUPERHEATING STEAM. APPLICATION rum) NOV. 2. 1904.

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rm: NORRIS PETERS co., WASHINGTON, n. c.

UNITED STATES PATENT OFFICE.

APPARATUS FOR.-SUPERHEATIING STEAM.

Specification of Letters Patent.

= PatentedAug. 14, L966.

Application'filed November 2,-:190,4.':--Seria1 No. 231,135.

To all 111720711, it may concern.-

Be it known that I, ANDREW BOLTON, a sub ect of the King of GreatBritain and Ireland, residing at 49 Deansgate, Manchester,-

in the county of Lancaster, England, have invented a new and usefulImproved Apparatus for Superheating Steam, of which the following is aspecification.

This invention relates to that class of ap paratus used for superheatingsteam, generally known as field-tube. superheaters, wherein the steamfrom the boiler passes through a box or chamber containing a series ofinner vertical tubes open at both ends, which are placed inside other orouter tubes open at their upper ends and closed at their lower ends,such tubes being suspended inside the downcast flue or the upcast flueof a Cornish or other suitable boiler, whereby the steam in passingthrough such tubes becomes superheated on its passage to the engine.

The manner in which my said invention is to be performed or carried intopractical effeet will be readily understood on reference to the twosheets of illustrative drawings hereunto annexed and the followingexplanation thereof.

Figure 1 on the drawings is a vertical section of a superheaterconstructed with an arched diaphragm dividing the outer box into threechambers according to my said improvements. Fig. 2 is a similar view ofa slight modification thereof hereinafter more particularly described.Figs. 3, 4, and 5 are horizontal sections showing diflerent arrangementsof the field-tubes. Fig. 6 is a vertical section showing the diaphragmmade in the form of an inverted arch; and Fig. 7 is a similar view of afurther modification of the same, embracing a combination in which adouble arched diaphragm is employed.

According to my present improvements, the flanged outer box a is dividedby an arched diaphragm 1) into three compartments 0, d, and e. Two ofthese chambers c and e act, respectively, as inlet and outlet chambersfor the steam to and from the superheater, and the third chamber at actsas an intermediate chamber. Through the diaphragm b I drill holes andinsert therein inner tubes f, open at both ends, and I drillcorresponding holes in the tube plate or bottom of the box a, (but oflarger diameter,) and I insert therein tubes 9, which are closed attheir lower ends and surround the inner tubes f so as to leave annularspaces-between them. Imake each-row of tubes in graduations of differentdiameters, as shown at Figs. 3, 4, and 5, and (by preference) I placethe larger tubes behind the smaller ones, either in a direct line, asshown at Fig. 3, or zigzagged, as shown at Figs. 4 and 5.

The consequence of the above-described construction of arched diaphragmand tubes is to divide the superheating-tubes into two or more groups.The steam admitted to the inlet-chamber c circulates through the firstset of tubes to the intermediate chamber (1 and in turn or seriesthrough the second set of tubes to the outlet-chamber e, which itenters-in a superheated state, and by placing smaller tubes in front ofthe larger tubes, as shown at Figs. 3, 4, and 5, their heating-surfacesare better exposed to the hot gases in the flue.

The arrows on the various views show the direction in which the steamcirculates through the three chambers 0, (Z, and e successively by meansof the respective arrangements of the field-tubes according to myinvention. In Figs. 1 and 2 the steam passes from the inlet-chamber cfirst down one set of inner tubesf and up the corresponding outer tubes9 to the intermediate chamber at and thence down the second set of outertubes and up the inner tubes to the outlet-chamber e, and in Figs. 6 and7 this order is reversed, the steam passing first down the first set ofouter tubes and up the corresponding inner tubes into the intermediatechamber d and thence down the second set of inner tubes and up thecorresponding outer tubes into the outlet-chamber e.

I claim as my invention- 1. An apparatus for superheating steam,

comprising an outer flanged box, and an arched diaphragm dividing saidbox into three compartments with communicating tubes.

2. An apparatus for superheating steam, comprising an outer flanged box,and an arched diaphragm dividing said box into three compartments, inletand outlet compartrnents and an intermediate compartment, withcommunicating tubes, one within another.

3. An apparatus for superheating steam, comprising an outer flanged box,and an arched diaphragm dividing said box into three compartments withcommunicating tubes, in combination with means connecting IIO saidcompartments, said means consisting of eters, the larger tubes arrangedzigzag behind a graduated series of tubes of different diamthe smallerones.

eters. In testimony whereof I have signed my 4. An apparatus forsuperheating steam, name to this specification in the presence ofcomprising an outer flanged box, and an two subscribing witnesses.

arched diaphragm dividing said boX into ANDREW BOLTON three compartmentswith communicating tubes, in combination with means connecting saidcompartments, said means consisting of a graduated series of tubes ofdifferent diam- 1 Witnesses J NO. HUGHEs, J. ERNEST HUGHES.

